Duchess Satine forbade the people of Mandalore from speaking Mando’a, their native language, and forced them to speak only Galactic Basic, the language of the Republic. Here’s all of the evidence to prove it!
First off, we have … Oh, wait. Satine’s the only named character in The Clone Wars who speaks Mando’a, and she even uses the warrior dialect of the Concordians.
And hmm … there’s Mando’a on the police speeders.
(Also note that the police carry and use blasters and flame throwers, so she hasn’t outlawed weapons either. Mandalorians are also not forbidden from carrying weapons within the city, which is why the Death Watch terrorist pictured above was carrying a blaster. The only people forbidden from carrying weapons are outsiders ... and that was only a rule solidified in The Clone Wars Season 3.)
But surely the children are only taught Basic …
Nope! The children of Mandalore are taught both Basic and Mando’a, but you can see that Mando’a is what Korkie is using on his tablet.
It’s clear the children are bilingual. They use Mando’a for their studies, but Ahsoka’s presentation is in Basic. It's likely that they are using Basic to converse with her but speak Mando'a amongst themselves.
In fact, the only place in Sundari where we see Basic is on the dome’s exits (this says “Hangar 1”), with the implication that they are accommodating travelers.
Huh. It’s almost like violence isn’t the only tradition that makes up Mandalorian culture, and Satine loves her Mandalorian heritage even as she believes (as the majority of Mandalorians did who confirmed her right to rule) that the time of peace had come.
